Rotary shaft structure

Abstract

A rotary shaft structure includes a rotary shaft having at least one restriction section and a bridge provided with at least one stop section. The bridge includes a first bridge member and a second bridge member. Each of the first and second bridge members has a pivot section. The pivot sections together define an internal space or room for pivotally connecting with the rotary shaft. The first and second bridge members are formed with bolt holes. At least one retainer is assembled at the bolt holes. The rotary shaft is permitted to rotate within the space or room defined by the pivot sections. The restriction section and the stop section interference with each other to provide locating effect for the rotary shaft when not rotated.

1 . A rotary shaft structure comprising a rotary shaft and a bridge, wherein:
 the rotary shaft has at least one restriction section, said rotary shaft being rotatable in opposing directions;   the bridge is provided with at least one stop section corresponding to the restriction section;   the bridge includes a first bridge member and a second bridge member, each of the first and second bridge members being displaced from each other and having a pivot section, the pivot sections together defining a space or room for pivotally connecting with the rotary shaft;   the first and second bridge members are formed with bolt holes; and   at least one retainer is assembled at the bolt holes, said first and second bridge members being further displaceable each with respect to the other responsive to a rotation of said rotary shaft in either of said opposing directions the rotary shaft within the space or room defined by the pivot sections of the first and second bridge members, whereby the restriction section and the stop section are matingly engaged to provide locating effect for the rotary shaft when not rotated, said stop section being slideably engaged with a surface of said rotary shaft during rotation.   
     
     
         2 . The rotary shaft structure as claimed in  claim 1 , wherein the first and second bridge members of the bridge are symmetrical to each other. 
     
     
         3 . The rotary shaft structure as claimed in  claim 1 , wherein the stop section is disposed on the first bridge member. 
     
     
         4 . The rotary shaft structure as claimed in  claim 1 , wherein the first and second bridge members have wing sections, the bolt holes being formed on the wing sections. 
     
     
         5 . The rotary shaft structure as claimed in  claim 1 , wherein the pivot sections of the first and second bridge members have an arcuate cross section. 
     
     
         6 . The rotary shaft structure as claimed in  claim 1 , wherein the first and second bridge members have wing sections positioned in horizontal reference axes, the wing sections extending from two sides of the pivot sections, the bolt holes being formed on the wing sections. 
     
     
         7 . The rotary shaft structure as claimed in  claim 1 , wherein at least one of the retainers is equipped with an elastic member. 
     
     
         8 . The rotary shaft structure as claimed in  claim 7 , wherein the elastic member is compressed at the bolt hole of the first bridge member. 
     
     
         9 . The rotary shaft structure as claimed in  claim 7 , wherein the elastic member is a coil spring. 
     
     
         10 . The rotary shaft structure as claimed in  claim 8 , wherein the elastic member is a coil spring. 
     
     
         11 . The rotary shaft structure as claimed in  claim 1 , wherein the restriction section of the rotary shaft is a channel. 
     
     
         12 . The rotary shaft structure as claimed in  claim 1 , wherein the restriction section of the rotary shaft is a channel extending along an axis of the rotary shaft. 
     
     
         13 . The rotary shaft structure as claimed in  claim 1 , wherein the stop section of the bridge is disposed on the pivot section of the first bridge member in the form of a ridge section. 
     
     
         14 . The rotary shaft structure as claimed in  claim 1 , wherein the restriction section of the rotary shaft and the stop section of the bridge extend along the same axis. 
     
     
         15 . The rotary shaft structure as claimed in  claim 1 , wherein the restriction section of the rotary shaft and the stop section of the bridge extend along the same axis, the restriction section having a length equal to that of the rotary shaft. 
     
     
         16 . The rotary shaft structure as claimed in  claim 1 , wherein the restriction section of the rotary shaft and the stop section of the bridge extend along the same axis, the restriction section having a length equal to that of the rotary shaft, the stop section having a length equal to a width of the bridge. 
     
     
         17 . The rotary shaft structure as claimed in  claim 1 , wherein the rotary shaft is formed with two restriction sections at 180-degree intervals. 
     
     
         18 . The rotary shaft structure as claimed in  claim 1 , wherein the rotary shaft has a first side and a second side defined on two sides of the restriction section, a distance between the first side and a center of the rotary shaft being shorter than a distance between the second side and the center of the rotary shaft. 
     
     
         19 . The rotary shaft structure as claimed in  claim 1 , wherein the bridge is provided with two stop sections formed on the first and second bridge members respectively. 
     
     
         20 . The rotary shaft structure as claimed in  claim 1 , wherein the rotary shaft has a first side and a second side defined on two sides of the restriction section, the rotary shaft further having a third side and a fourth side formed on smooth sections of the rotary shaft adjacent to said first and second sections, a distance between the third side and/or the fourth side and a center of the rotary shaft being longer than a distance between the first side and/or the second side and the center of the rotary shaft. 
     
     
         21 . The rotary shaft structure as claimed in  claim 1 , wherein the rotary shaft has a cross section in the form of a cam. 
     
     
         22 . The rotary shaft structure as claimed in  claim 1 , wherein the rotary shaft has a first side and a second side defined on two sides of the restriction section, a distance between the first side and a center of the rotary shaft being equal to a distance between the second side and the center of the rotary shaft. 
     
     
         23 . The rotary shaft structure as claimed in  claim 1 , wherein the restriction section of the rotary shaft is in the form of a ridge section. 
     
     
         24 . The rotary shaft structure as claimed in  claim 1 , wherein the stop section of the bridge is a channel. 
     
     
         25 . The rotary shaft structure as claimed in  claim 1 , wherein the rotary shaft has the form of a cylindrical body. 
     
     
         26 . The rotary shaft structure as claimed in  claim 1 , wherein the retainer is a bolt.